Expressing HRNAi with esgTS-FO (G) induces EC differentiation, some EE differentiation (asterisk), and the expression of the NRE-lacZ reporter in all esg+ cells (solid arrowhead). Simultaneous expression of da:da (H) blocks the formation of ECs, as in esgTS-FO>da:da alone, and all cells become NRE-lacZ+ (solid arrowheads).
